RE: PT/PD MOGULS, MAESTROS & GURUS
DEAR CHRISTINA, I do have HCl in the "pool cleaner" form. I will see if I can do the 1:60 dilution test on one of the test strips that I have kept. I will tear it in half such that I have the same tones on both pieces, "bleach" one and then do a dry comparison. I may even get out my X-Rite and be somewhat scientific about it! CHEERS! BOB -----Original Message----- From: Christina Z. Anderson [mailto:zphoto@montana.net] Sent: Wednesday, February 14, 2007 12:39 AM To: Alt, List Subject: Re: PT/PD MOGULS, MAESTROS & GURUS Thanks, John, for saving me time locating my source; you are exactly correct. Eric, since you have hydrochloric acid (alas I was wrong, I only have sulfuric, nitric, and phosphoric) and since pt/pd is your process of choice, why don't you do a step wedge of each and tell us what you find? BTW, John, I checked Neblette's 4th edition and I can't find the Nadeau source there, even though there is a chapter on pt/pd. Neblette quotes Clerc and a couple others, tho. But Bob, back to your original question--do you even have HCL and can you see if a dilute mix will do what you need it to do? Isn't HCL that pool chemical stuff that one could get at a hardware store? Chris ----- Original Message ----- From: "John Roseborough" <platinumprinter@msn.com> To: <alt-photo-process-l@usask.ca> Sent: Tuesday, February 13, 2007 11:59 AM Subject: Re: PT/PD MOGULS, MAESTROS & GURUS > Eric, > > In "The History and Practice of Platinum Printing" by Luis Nadeau (2nd > edition) page 32, Nadeau states that HCl is to be used highly diluted to > 1% - 1.5% for Platinum and 0.5% for Palladium. > > John Roseborough > > ----- Original Message ----- > From: "Eric Neilsen" <ejnphoto@sbcglobal.net> > To: <alt-photo-process-l@usask.ca> > Sent: Tuesday, February 13, 2007 8:46 AM > Subject: RE: PT/PD MOGULS, MAESTROS & GURUS > > >> Chris, WHERE is that note taken from? >> >> Eric Neilsen Photography >> 4101 Commerce Street >> Suite 9 >> Dallas, TX 75226 >> http://e.neilsen.home.att.net >> http://ericneilsenphotography.com >> Skype ejprinter >> >>> -----Original Message----- >>> From: Christina Z. Anderson [mailto:zphoto@montana.net] >>> Sent: Tuesday, February 13, 2007 8:43 AM >>> To: alt-photo-process-l@usask.ca >>> Subject: Re: PT/PD MOGULS, MAESTROS & GURUS >>> >>> Bob, >>> Even tho I have hydrochloric acid I have never used it to reduce a >>> print. >>> My notes say "palladium is more soluble in strong acids, so if you use >>> hydrochloric acid, the traditional clearing bath, your dilution of that >>> clearing bath is 0.5%, not 1% as it is with platinum." I, too, am >>> interested >>> if this is wrong? And I wonder if it will work when using >>> NA2/palladium...hmmm...I have a too dark print, maybe I should just go >>> do >>> it. >>> Chris >>> >>> >>> > DEAR PT/PD MOGULS, MAESTROS & GURUS ON THIS LIST, >>> > Please help me resolve what appears to be a conflict in both the >>> > literature and common wisdom. >>> > Here are the two conflicting bits of info: >>> > 1) You must not use a hydrochloric first clearing bath when printing >>> with >>> > palladium as it will bleach the print, even though the concentration >>> > should >>> > be around 1 to 1.5 %. >>> > 2) Recently, when I asked the list if there was any way to slightly >>> reduce >>> > the density of a Palladium print I was told that the concentration of >>> HCl >>> > necessary to have any effect would be so high that it would be >>> > dangerous >>> > to >>> > use in a regular darkroom and might have deleterious effects on the >>> paper. >>> > I was told to just make another, lighter print. >>> > *********So, you can see my dilemma. Is this not a contradiction? >>> > 'Tis >>> a >>> > puzzlement! Please enlighten me...as it were! >>> > CHEERS!> BOB >>> >> >> >> >> > >
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